Okay, imagine you have a toy car that needs a push to go faster. Now imagine if you put a little electric fan in the car that makes wind and pushes the car forward. That's kind of like what an electric turbo compound does for a big car engine.
So when a car drives, it needs fuel and air to make it go. A regular turbocharger helps get more air into the engine, which makes it go faster. But sometimes the engine makes too much air and it's wasted. That's where the electric turbo compound comes in.
The electric turbo compound (ETC) is like a regular turbocharger, but it also has an electric motor attached to it. This motor takes the wasted energy from the engine (which is usually lost as heat) and uses it to power the ETC. This makes the engine work more efficiently and use less fuel.
So basically, the ETC takes the wasted energy from the engine and turns it into useful energy to help the car run better. It's kind of like having a little helper that makes the car go faster without using more gas.